CN103193508A - Method for improving high temperature mechanical properties of hollow turbine blade ceramic mold - Google Patents
Method for improving high temperature mechanical properties of hollow turbine blade ceramic mold Download PDFInfo
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- CN103193508A CN103193508A CN2013100443857A CN201310044385A CN103193508A CN 103193508 A CN103193508 A CN 103193508A CN 2013100443857 A CN2013100443857 A CN 2013100443857A CN 201310044385 A CN201310044385 A CN 201310044385A CN 103193508 A CN103193508 A CN 103193508A
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- 239000000919 ceramic Substances 0.000 title claims abstract description 105
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000005245 sintering Methods 0.000 claims abstract description 47
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 44
- 238000007598 dipping method Methods 0.000 claims abstract description 25
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 claims abstract description 20
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000005728 strengthening Methods 0.000 claims abstract description 18
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 15
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 15
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000013078 crystal Substances 0.000 claims abstract description 13
- OBOSXEWFRARQPU-UHFFFAOYSA-N 2-n,2-n-dimethylpyridine-2,5-diamine Chemical compound CN(C)C1=CC=C(N)C=N1 OBOSXEWFRARQPU-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910019901 yttrium aluminum garnet Inorganic materials 0.000 claims abstract description 11
- JNDMLEXHDPKVFC-UHFFFAOYSA-N aluminum;oxygen(2-);yttrium(3+) Chemical compound [O-2].[O-2].[O-2].[Al+3].[Y+3] JNDMLEXHDPKVFC-UHFFFAOYSA-N 0.000 claims abstract description 10
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims abstract description 7
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 21
- 239000000758 substrate Substances 0.000 claims description 21
- 238000005470 impregnation Methods 0.000 claims description 20
- 239000000243 solution Substances 0.000 claims description 20
- 239000007787 solid Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000000843 powder Substances 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 238000005266 casting Methods 0.000 claims description 13
- 238000004108 freeze drying Methods 0.000 claims description 13
- PCMOZDDGXKIOLL-UHFFFAOYSA-K yttrium chloride Chemical compound [Cl-].[Cl-].[Cl-].[Y+3] PCMOZDDGXKIOLL-UHFFFAOYSA-K 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 10
- 238000005516 engineering process Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 6
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 5
- 239000011837 N,N-methylenebisacrylamide Substances 0.000 claims description 5
- DPDMMXDBJGCCQC-UHFFFAOYSA-N [Na].[Cl] Chemical compound [Na].[Cl] DPDMMXDBJGCCQC-UHFFFAOYSA-N 0.000 claims description 5
- 238000000498 ball milling Methods 0.000 claims description 5
- 238000001723 curing Methods 0.000 claims description 5
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 5
- 239000003999 initiator Substances 0.000 claims description 5
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 claims description 5
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 5
- 238000001291 vacuum drying Methods 0.000 claims description 5
- 238000007710 freezing Methods 0.000 claims description 3
- 230000008014 freezing Effects 0.000 claims description 3
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 3
- 239000011800 void material Substances 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 2
- 239000011230 binding agent Substances 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000011734 sodium Substances 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 229910010293 ceramic material Inorganic materials 0.000 abstract description 4
- 239000011258 core-shell material Substances 0.000 abstract description 3
- 229910052700 potassium Inorganic materials 0.000 abstract description 3
- 229910052708 sodium Inorganic materials 0.000 abstract description 3
- 239000012535 impurity Substances 0.000 abstract description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 abstract 2
- 229910052727 yttrium Inorganic materials 0.000 abstract 2
- -1 yttrium ions Chemical class 0.000 abstract 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract 1
- 239000000956 alloy Substances 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 150000002500 ions Chemical class 0.000 abstract 1
- 239000001103 potassium chloride Substances 0.000 abstract 1
- 235000011164 potassium chloride Nutrition 0.000 abstract 1
- 239000011780 sodium chloride Substances 0.000 abstract 1
- 239000012071 phase Substances 0.000 description 8
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 238000005303 weighing Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- KWYHDKDOAIKMQN-UHFFFAOYSA-N N,N,N',N'-tetramethylethylenediamine Chemical compound CN(C)CCN(C)C KWYHDKDOAIKMQN-UHFFFAOYSA-N 0.000 description 3
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 229910001338 liquidmetal Inorganic materials 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000007790 solid phase Substances 0.000 description 3
- 238000009777 vacuum freeze-drying Methods 0.000 description 3
- 230000002742 anti-folding effect Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000000016 photochemical curing Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 229910000601 superalloy Inorganic materials 0.000 description 2
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 2
- 241000370738 Chlorion Species 0.000 description 1
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 239000000446 fuel Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000010437 gem Substances 0.000 description 1
- 229910001751 gemstone Inorganic materials 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
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- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 229910000753 refractory alloy Inorganic materials 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
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Abstract
The invention discloses a method for improving high temperature mechanical properties of a hollow turbine blade ceramic mold. According to the invention, a yttrium-aluminum garnet high temperature strengthening phase is synthesized from yttrium oxide and alumina through high temperature sintering, magnesium oxide is utilized at the same time for inhibiting growth of an alumina crystal grain under the condition of high temperature sintering, and titanium oxide is used for solution strengthening of alumina so as to improve high temperature strength of an alumina-based ceramic mold; finally, an yttrium chloride ion solution is used for dipping of the alumina-based ceramic mold to allow yttrium ions to be uniformly distributed in the alumina-based ceramic mold with a complex structure, so on the one hand, chloride ions are enabled to react with impurity Na and K ions in an alumina ceramic material to form sodium chloride and potassium chloride under high temperature sintering, thereby removing the Na element and the K element, and on the other hand, the yttrium ions are enabled to react with alumina under high temperature sintering for secondary formation of the yttrium-aluminum garnet high temperature strengthening phase. The method provided by the invention can be used for improving high temperature mechanical properties of a core-shell integrated alumina-based ceramic mold for a hollow turbine blade and improves a qualified rate of a directionally solidified high temperature alloy blade.
Description
Technical field
The invention belongs to quick casting technology field, relate to a kind of method that improves hollow turbine vane ceramic-mould mechanical behavior under high temperature.
Background technology
Turbine blade is first key part of aircraft engine and internal combustion turbine, and is the highest because of its working temperature, stress is the most complicated, environment is the most abominable is described as " jewel on the crown ".Turbine blade is worked under higher temperature can obtain higher power, studies show that, and 100 ℃ of the every liftings in the scope of 1073K ~ 1273K of fuel gas inlet temperature, the output rating of internal combustion turbine will increase by 20% ~ 25%, fuel saving 6% ~ 7%.Yet be subjected to the restriction of melting point metal, the existing temperature that can bear for the preparation of the refractory alloy of turbine blade has reached the limit.In order to address this problem, common way is that the turbine blade that is operated in the hot environment is cooled off.Thereby improving the cooling structure of blade, the cooling efficiency that improves blade has become the main path that improves the blade heat-resisting ability.Adopt existing turbine blade manufacture method, be difficult to make complicated cooling structure hollow turbine vane.Monoblock type ceramic-mould manufacturing process based on photocuring moulding technology provides new way for the manufacturing that solves complicated cooling structure hollow turbine vane, and its technical process is as follows: at first adopt photocuring moulding technology to produce the SL resin minus of turbine blade; Secondly, the preparation ceramic size utilizes gel-casting method that ceramic size is injected SL resin minus, treat the ceramic size in-situ solidifying after, utilize Vacuum Freezing ﹠ Drying Technology to remove moisture, guarantee the dimensional precision of base substrate simultaneously; Then, burn loss of gloss cured resin minus, set up presintering intensity; Adopt compressed air stream to remove residual ashes, flood by the Yttrium trichloride solion, be sintered to 1300 ~ 1500 ℃ of high temperature then, with further raising casting mold hot strength, satisfy the technical requirements of directional freeze; At last, the cast high-temperature liquid metal carries out depoling to foundry goods after the directional freeze and handles to ceramic-mould, realizes hollow turbine vane.
In the turbine blade directional solidification casting, the monoblock type ceramic-mould not only bears thermal shocking and the mechanical shock of high-temperature liquid metal, and ceramic-mould will keep longer for some time in the high-temperature liquid metal more than 1500 ℃ usually.Therefore, ceramic-mould must possess the excellent high-temperature mechanical property.But owing to adopt stupalith of the same race in the integrated manufacturing process of ceramic core shell, and the ceramic-mould porosity is bigger, causes the ceramic-mould mechanical behavior under high temperature to be difficult to satisfy the technical requirements of directional freeze.For this reason, must carry out intensive treatment to ceramic-mould.
Summary of the invention
The problem that the present invention solves is to provide a kind of method that improves hollow turbine vane ceramic-mould mechanical behavior under high temperature, by solution strengthening and synthesizing high temperature strengthening phase, adopt simultaneously under the hot conditions and remove element Na and the K element that glassy phase forms by combination reaction, improved the mechanical behavior under high temperature of alumina-based ceramic casting mold.
The present invention is achieved through the following technical solutions:
A kind of method that improves hollow turbine vane ceramic-mould mechanical behavior under high temperature may further comprise the steps:
1) salic, the titanium oxide of preparation, yttrium oxide and magnesian ceramic size are made the alumina-based ceramic casting mold base substrate of hollow turbine vane by gel injection technology;
2) under-30～-60 ℃ of conditions, treat in the alumina-based ceramic base substrate that crystal water forms ice crystal after, vacuum-drying under 10 ~ 100Pa condition, presintering obtains ceramic then;
3) ceramic is put into the vacuum impregnation of Yttrium trichloride solion, made the Yttrium trichloride solion infiltrate in the ceramic internal void fully, uniformly;
4) will flood the lyophilize of ceramic secondary vacuum, high temperature sintering then, sintering temperature is 1200～1500 ℃, makes the reaction of yttrium oxide and alumina-based ceramic goods generate high temperature resistant strengthening phase yttrium aluminum garnet; Wherein, magnesium oxide suppresses the growth of alumina grain under the high temperature sintering condition, titanium oxide solution strengthening aluminum oxide, and sodium-chlor, Repone K and magnesium chloride evaporative removal that high temperature is synthetic simultaneously improves the mechanical behavior under high temperature of hollow turbine vane ceramic-mould.
In mass fraction, comprise the oxide compound of following component in the described ceramic size:
85～90 parts aluminum oxide, 1～5 part magnesium oxide, 5～10 parts yttrium oxide, 0.2～1 part titanium oxide.
Described aluminum oxide comprises the particle of multiple size, comprises that at least particle diameter is the aluminum oxide of 30～40 μ m and two kinds of particles of 2～5 μ m;
The size of described magnesium oxide, titanium oxide is 30～40 μ m; The size of yttrium oxide is 20～50nm.
Described alumina-based ceramic base substrate by gel injection prepared hollow turbine vane may further comprise the steps:
1) press the gel injection processing requirement, with acrylamide, N,N methylene bis acrylamide and the sodium polyacrylate of certain mass ratio, mix the back and add deionized water, stirring and dissolving is mixed with organism quality concentration and is 10～20% premixed liquid;
2) by following mass ratio, the aluminum oxide with 85～90%, 1～5% magnesium oxide, 5～10% yttrium oxide and 0.2～1% the abundant mixing of titanium oxide obtain solid powder;
3) solid powder is joined in the premixed liquid, fully stir, and to regulate pH be 9～11, prepare solid load and be 55～65% ceramic size;
4) with after the abundant Ball milling of ceramic size, in ceramic size, add catalyzer, initiator respectively, be poured into after stirring in the high hollow turbine vane mould, treat that the organism curing reaction in the ceramic size is finished, obtain the alumina-based ceramic base substrate.
Described alumina-based ceramic base substrate is vacuum-drying under 10～100Pa in vacuum tightness after freezing under-30～-60 ℃ of conditions, the ceramic that obtains having bending strength at 1100～1300 ℃ of following sintering 1～3h after the demoulding.
The mass concentration of described Yttrium trichloride solion is 10～30%, and vacuum-impregnated vacuum tightness is 1000～3000Pa, and dipping time is 5～20min.
Describedly also strengthen dipping effect by reducing vacuum tightness, wherein dipping Yttrium trichloride solion does not seethe with excitement under the minimum vacuum tightness.
Describedly also improve the vacuum impregnation effect by what increase the vacuum impregnation number of times, the repeated impregnations process is: dipping is finished, vacuum lyophilization, high temperature binder removal, dipping again; Vacuum lyophilization is carried out under-30～-60 ℃, 10～100Pa, and the high temperature dump temperature is 700～1000 ℃.
Described also by yttrium chloride solution being carried out 1000 ~ 3000Pa vacuum outgas processing, in yttrium chloride solution, no longer produce bubble to improve dipping efficient.
Describedly will flood ceramic vacuum lyophilization under vacuum tightness 10～100Pa condition; At 1200～1500 ℃ of following sintering 3～6h, make yttrium oxide and the ceramic reaction of alumina base generate High-Temperature Strengthening phase yttrium aluminum garnet.
Compared with prior art, the present invention has following beneficial technical effects:
The method of raising hollow turbine vane ceramic-mould mechanical behavior under high temperature provided by the invention, adopt conventional gel injection technology alumina-based ceramic base substrate, sintering generates the alumina-based ceramic goods with hole, and then by the dipping yttrium chloride solution, its molecular diameter is less than 1nm, be immersed in ceramic inside easily, behind the immersion alumina-based ceramic material hole, yttrium chloride solution at high temperature is converted into tiny yttria particles.During high temperature sintering, yttria particles and alumina substrate react and generate high temperature resistant strengthening phase---yttrium aluminum garnet, thereby reach the purpose that improves the alumina-based ceramic material mechanical behavior under high temperature.
A kind of method that improves hollow turbine vane alumina-based ceramic casting mold mechanical behavior under high temperature that the present invention proposes, main by interpolation titanium oxide, yttrium oxide, magnesium oxide mineralizer, and adopt Yttrium trichloride solion dipping.Behind dipping: yttrium oxide generates yttrium aluminum garnet High-Temperature Strengthening phase with aluminum oxide under high temperature sintering, adopt magnesium oxide to suppress the growth of alumina grain under the high temperature sintering condition simultaneously, and pass through titanium oxide solution strengthening aluminum oxide to improve alumina-based ceramic casting mold hot strength; And the aluminium base ceramic-mould of employing Yttrium trichloride solion oxide impregnation, so that ruthenium ion is uniformly distributed in complex construction alumina-based ceramic casting mold inside, impel on the one hand under the high temperature sintering impurity Na, K ionic reaction formation sodium-chlor and Repone K in the chlorion and alumina ceramic material, utilize sodium-chlor and the easy characteristics of evaporating of Repone K more than 1300 ℃, remove element Na, K, impel ruthenium ion and aluminum oxide reaction secondary formation yttrium aluminum garnet High-Temperature Strengthening phase under the high temperature sintering on the other hand, thereby make the good ceramic-mould of mechanical behavior under high temperature.
Further, the present invention also reduces vacuum tightness by comprising, increases the vacuum impregnation number of times, increases vibration source and improve dipping efficient.
The method of raising hollow turbine vane ceramic-mould mechanical behavior under high temperature provided by the invention, it is obvious to improve the mechanical behavior under high temperature effect:
The intensity that adopts the anti-folding instrument of GKZ high temperature to test ceramic standard specimen, the standard specimen specification is 60mm * 10mm * 4mm, and the support span is 30mm, and probe temperature is 1300 ℃.Dipping pre-ceramic standard specimen is 15 ~ 18MPa 1300 ℃ intensity, flood twice yttrium chloride solution after, standard specimen intensity is brought up to 25 ~ 30MPa.The present invention can be applicable to the raising of hollow turbine vane core shell integrated oxidization Al-base ceramic casting mold high-temperature behavior, hollow turbine vane alumina-based ceramic casting mold by manufacturing of the present invention has higher high temperature strength, thereby has improved the qualification rate of directionally solidified superalloy, DS superalloy blade.
Embodiment
The present invention is described in further detail below in conjunction with specific embodiment, and the explanation of the invention is not limited.
A kind of method that improves hollow turbine vane ceramic-mould mechanical behavior under high temperature may further comprise the steps:
1) salic, the titanium oxide of preparation, yttrium oxide and magnesian ceramic size are by the alumina-based ceramic casting mold base substrate of gel injection prepared hollow turbine vane;
2) under-30～-60 ℃ of conditions, treat in the alumina-based ceramic base substrate that crystal water forms ice crystal after, vacuum-drying under 10 ~ 100Pa condition, presintering obtains ceramic then;
3) ceramic is put into the vacuum impregnation of Yttrium trichloride solion, the Yttrium trichloride solion is fully infiltrated in the ceramic internal void;
4) will flood the lyophilize of ceramic secondary vacuum, high temperature sintering then, sintering temperature is 1200～1500 ℃, makes the reaction of yttrium oxide and alumina-based ceramic goods generate high temperature resistant strengthening phase yttrium aluminum garnet; Wherein, magnesium oxide suppresses the growth of alumina grain under the high temperature sintering condition, titanium oxide solution strengthening aluminum oxide, sodium-chlor, Repone K and the magnesium chloride evaporative removal that high temperature is synthesized impels ruthenium ion and aluminum oxide reaction secondary formation yttrium aluminum garnet High-Temperature Strengthening phase under the high temperature sintering simultaneously
,Improve the mechanical behavior under high temperature of hollow turbine vane ceramic-mould.
Be described in detail with embodiment below:
Embodiment 1
A kind of method that improves hollow turbine vane ceramic-mould mechanical behavior under high temperature may further comprise the steps:
(1) by gel injection prepared alumina-based ceramic base substrate
1) presses the mass ratio of mass ratio 20～25:1, be specially the ratio of 24:1, weighing acrylamide (AM, monomer) and N, N-methylene-bisacrylamide (MBAM, linking agent) and sodium polyacrylate (dispersion agent) organism such as (solid phase powder 2wt%) is sneaked in the deionized water, stirring and dissolving is mixed with organic concentration and is 15% premixed liquid.
2 press mass ratio weighing solid powder (30 ~ 40 μ m aluminum oxide: 2 ~ 5 μ m aluminum oxide: 30 ~ 40 μ m magnesium oxide: 20 ~ 50nm yttrium oxide: 30 ~ 40 μ m titanium oxide=55 ~ 60:26 ~ 31:2 ~ 3:6 ~ 8:0.5 ~ 1), and solid powder stirred, mixes in container.
3) solid powder that mixes is slowly joined in the premixed liquid, and constantly stir, add proper ammonia and regulate PH to 9 ~ 11, prepare the ceramic size that solid load is 55-65%.
4) with slurry ball milling 1 hour on planetary ball mill, disperse, obtain the ceramic size of good fluidity.
5) in ceramic size, add catalyzer (Tetramethyl Ethylene Diamine), initiator (ammonium persulfate solution) respectively, be poured in the mould at vibrating forming machine after stirring, in 5 ~ 15min, the organism generation curing reaction in the ceramic size forms ceramic body.
(2) presintering obtains having the ceramic of certain intensity
Ceramic body is put into-30 ℃--60 ℃ reach in freezer, treat that crystal water is frozen into ice crystal fully in the base substrate after, (vacuum tightness is 10 ~ 100Pa) to utilize vacuum freeze-drying technique to carry out drying.Carry out presintering with putting into high temperature sintering furnace after the ceramic demoulding after the lyophilize, sintering temperature is 1250 ℃, and sintering 2-4h is in order to remove the resin minus and improve green strength.
(3) vacuum impregnation
1) ceramic body that has certain room temperature strength after the presintering is immersed in the yttrium chloride solution that mass concentration is 20%-30% carry out vacuum impregnation, vacuum tightness is about 1000-3000Pa, and dipping time is 10min.
2) after single-steeping is finished, ceramic is carried out vacuum lyophilization again, be heated 800 ℃～1000 ℃ then and carry out sintering processes, repeated impregnations 2 to 3 times.
(4) high temperature sintering
To flood the ceramic vacuum lyophilization, and then the dipping ceramic-mould be carried out high temperature sintering, sintering temperature is 1400 ℃～1500 ℃, and sintering time is 3～6h.
The intensity that adopts the anti-folding instrument of GKZ high temperature to test ceramic standard specimen, the standard specimen specification is 60mm * 10mm * 4mm, and the support span is 30mm, and probe temperature is 1300 ℃.Dipping pre-ceramic standard specimen hot strength is 15 ~ 18MPa, flood twice yttrium chloride solution after, the standard specimen hot strength is brought up to 25 ~ 30MPa.
Embodiment 2
A kind of method that improves hollow turbine vane ceramic-mould mechanical behavior under high temperature may further comprise the steps:
(1) by gel injection prepared alumina-based ceramic base substrate
1) presses the mass ratio weighing acrylamide (AM of 25:1, monomer) and N, N-methylene-bisacrylamide (MBAM, linking agent) and sodium polyacrylate (dispersion agent) organism such as (solid phase powder 2wt%), sneak in the deionized water, stirring and dissolving is mixed with organic concentration and is 10% premixed liquid.
2 press mass ratio weighing solid powder (30 ~ 40 μ m aluminum oxide: 2 ~ 5 μ m aluminum oxide: 30 ~ 40 μ m magnesium oxide: 20 ~ 50nm yttrium oxide: 30 ~ 40 μ m titanium oxide=40 ~ 65:25 ~ 38:4 ~ 5:5 ~ 10:0.2 ~ 0.5), and solid powder stirred, mixes in container.
3) solid powder that mixes is slowly joined in the premixed liquid, and constantly stir, add proper ammonia and regulate PH to 10 ~ 10.8, prepare solid load and be 60% ceramic size.
4) with slurry ball milling 1 hour on planetary ball mill, disperse, obtain the ceramic size of good fluidity.
5) in ceramic size, add catalyzer (Tetramethyl Ethylene Diamine), initiator (ammonium persulfate solution) respectively, be poured in the mould at vibrating forming machine after stirring, in 5 ~ 15min, the organism generation curing reaction in the ceramic size forms ceramic body.
(2) presintering obtains having the ceramic of certain intensity
Ceramic body is put into-30 ℃--60 ℃ reach in freezer, treat that crystal water is frozen into ice crystal fully in the base substrate after, (vacuum tightness is 10 ~ 100Pa) to utilize vacuum freeze-drying technique to carry out drying.Carry out presintering with putting into high temperature sintering furnace after the ceramic demoulding after the lyophilize, sintering temperature is 1200 ℃, in order to remove the resin minus and improve green strength.
(3) vacuum impregnation
1) ceramic body that has certain room temperature strength after the presintering is immersed in the yttrium chloride solution that mass concentration is 20%-30% carry out vacuum impregnation, vacuum tightness is about 2000-3000Pa, and dipping time is 5～8min.
2) after single-steeping is finished, ceramic is carried out vacuum lyophilization again, be heated 800 ℃～1000 ℃ then and carry out sintering processes, sintering 1-2h, repeated impregnations 2 to 3 times.
(4) high temperature sintering
To flood the ceramic vacuum lyophilization, and then the dipping ceramic-mould be carried out high temperature sintering, sintering temperature is 1300 ℃～1500 ℃.
Embodiment 3
A kind of method that improves hollow turbine vane ceramic-mould mechanical behavior under high temperature may further comprise the steps:
(1) by gel injection prepared alumina-based ceramic base substrate
1) presses the mass ratio of mass ratio 20:1, weighing acrylamide (AM, monomer) and N, N-methylene-bisacrylamide (MBAM, linking agent) and sodium polyacrylate (dispersion agent) organism such as (solid phase powder 2wt%), sneak in the deionized water, stirring and dissolving is mixed with organic concentration and is 20% premixed liquid.
2 press mass ratio weighing solid powder (30 ~ 40 μ m aluminum oxide: 2 ~ 5 μ m aluminum oxide: 30 ~ 40 μ m magnesium oxide: 20 ~ 50nm yttrium oxide: 30 ~ 40 μ m titanium oxide=60 ~ 65:20 ~ 35:1 ~ 4:7 ~ 10:0.5 ~ 0.8), and solid powder stirred, mixes in container.
3) solid powder that mixes is slowly joined in the premixed liquid, and constantly stir, add proper ammonia and regulate PH to 9 ~ 10, prepare the ceramic size that solid load is 55-65%.
4) with slurry ball milling 1 hour on planetary ball mill, disperse, obtain the ceramic size of good fluidity.
5) in ceramic size, add catalyzer (Tetramethyl Ethylene Diamine), initiator (ammonium persulfate solution) respectively, be poured in the mould at vibrating forming machine after stirring, in 10 ~ 15min, the organism generation curing reaction in the ceramic size forms ceramic body.
(2) presintering obtains having the ceramic of certain intensity
Ceramic body is put into-30 ℃--60 ℃ reach in freezer, treat that crystal water is frozen into ice crystal fully in the base substrate after, (vacuum tightness is 10 ~ 100Pa) to utilize vacuum freeze-drying technique to carry out drying.Carry out presintering with putting into high temperature sintering furnace after the ceramic demoulding after the lyophilize, sintering temperature is 1200 ℃, and sintering 2-4h is in order to remove the resin minus and improve green strength.
(3) vacuum impregnation
1) ceramic body that has certain room temperature strength after the presintering is immersed in the yttrium chloride solution that mass concentration is 10%-15% carry out vacuum impregnation, vacuum tightness is about 1000-1500Pa, and dipping time is 15-20min.
2) after single-steeping is finished, ceramic is carried out vacuum lyophilization again, be heated 800 ℃～1000 ℃ then and carry out sintering processes, repeated impregnations 2 to 3 times.
(4) high temperature sintering
To flood the ceramic vacuum lyophilization, and then the dipping ceramic-mould be carried out high temperature sintering, sintering temperature is 1400 ℃～1500 ℃, and sintering time is 3～6h.
Claims (10)
1. a method that improves hollow turbine vane ceramic-mould mechanical behavior under high temperature is characterized in that, may further comprise the steps:
1) salic, the titanium oxide of preparation, yttrium oxide and magnesian ceramic size are made the alumina-based ceramic casting mold base substrate of hollow turbine vane by gel injection technology;
2) under-30～-60 ℃ of conditions, treat in the alumina-based ceramic base substrate that crystal water forms ice crystal after, vacuum-drying under 10 ~ 100Pa condition, presintering obtains ceramic then;
3) ceramic is put into the vacuum impregnation of Yttrium trichloride solion, the Yttrium trichloride solion is fully infiltrated in the ceramic internal void;
4) will flood the ceramic vacuum lyophilization, high temperature sintering then, sintering temperature is 1200～1500 ℃, makes the reaction of yttrium oxide and alumina-based ceramic goods generate high temperature resistant strengthening phase yttrium aluminum garnet; Wherein, magnesium oxide suppresses the growth of alumina grain under the high temperature sintering condition, titanium oxide solution strengthening aluminum oxide, and sodium-chlor, Repone K and magnesium chloride evaporative removal that high temperature is synthetic simultaneously improves the mechanical behavior under high temperature of hollow turbine vane ceramic-mould.
2. the method for raising hollow turbine vane ceramic-mould mechanical behavior under high temperature as claimed in claim 1 is characterized in that, in mass fraction, comprises the oxide compound of following component in the described ceramic size:
85～90 parts aluminum oxide, 1～5 part magnesium oxide, 5～10 parts yttrium oxide, 0.2～1 part titanium oxide.
3. the method for raising hollow turbine vane ceramic-mould mechanical behavior under high temperature as claimed in claim 2 is characterized in that described aluminum oxide comprises the particle of multiple size, comprises that at least particle diameter is the aluminum oxide of 30～40 μ m and two kinds of particles of 2～5 μ m;
The size of described magnesium oxide, titanium oxide is 30～40 μ m; The size of yttrium oxide is 20～50nm.
4. the method for raising hollow turbine vane ceramic-mould mechanical behavior under high temperature as claimed in claim 1 is characterized in that, described alumina-based ceramic base substrate by gel injection prepared hollow turbine vane may further comprise the steps:
1) press the gel injection processing requirement, with acrylamide, N,N methylene bis acrylamide and the sodium polyacrylate of certain mass ratio, mix the back and add deionized water, stirring and dissolving is mixed with organism quality concentration and is 10～20% premixed liquid;
2) by following mass ratio, the aluminum oxide with 85～90%, 1～5% magnesium oxide, 5～10% yttrium oxide and 0.2～1% the abundant mixing of titanium oxide obtain solid powder;
3) solid powder is joined in the premixed liquid, fully stir, and to regulate pH be 9～11, prepare solid load and be 55～65% ceramic size;
4) with after the abundant Ball milling of ceramic size, in ceramic size, add catalyzer, initiator respectively, be poured into after stirring in the high hollow turbine vane mould, treat that the organism curing reaction in the ceramic size is finished, obtain the alumina-based ceramic base substrate.
5. the method for raising hollow turbine vane ceramic-mould mechanical behavior under high temperature as claimed in claim 1, it is characterized in that, described alumina-based ceramic base substrate is after freezing under-30～-60 ℃ of conditions, be vacuum-drying under 10～100Pa in vacuum tightness, the ceramic that obtains having bending strength at 1100～1300 ℃ of following sintering 1～3h after the demoulding.
6. the method for raising hollow turbine vane ceramic-mould mechanical behavior under high temperature as claimed in claim 1, it is characterized in that, the mass concentration of described Yttrium trichloride solion is 10～30%, and vacuum-impregnated vacuum tightness is 1000～3000Pa, and dipping time is 5～20min.
7. the method for raising hollow turbine vane ceramic-mould mechanical behavior under high temperature as claimed in claim 6 is characterized in that, also strengthens dipping effect by reducing vacuum tightness, and wherein dipping Yttrium trichloride solion does not seethe with excitement under the minimum vacuum tightness.
8. the method for raising hollow turbine vane ceramic-mould mechanical behavior under high temperature as claimed in claim 1, it is characterized in that, also improve the vacuum impregnation effect by what increase the vacuum impregnation number of times, the repeated impregnations process is: dipping is finished, vacuum lyophilization, high temperature binder removal, dipping again; Vacuum lyophilization is carried out under-30～-60 ℃, 10～100Pa, and the high temperature dump temperature is 700～1000 ℃.
9. the method for raising hollow turbine vane ceramic-mould mechanical behavior under high temperature as claimed in claim 1, it is characterized in that, also handle by yttrium chloride solution being carried out 1000 ~ 3000Pa vacuum outgas, in yttrium chloride solution, no longer produce bubble to improve dipping efficient.
10. the method for raising hollow turbine vane ceramic-mould mechanical behavior under high temperature as claimed in claim 1 is characterized in that, will flood ceramic vacuum lyophilization under vacuum tightness 10～100Pa condition; At 1200～1500 ℃ of following sintering 3～6h, make yttrium oxide and the ceramic reaction of alumina base generate High-Temperature Strengthening phase yttrium aluminum garnet.
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| CN110732637A (en) * | 2019-09-25 | 2020-01-31 | 西安交通大学 | turbine blade air film hole precision forming method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103386703A (en) * | 2013-07-24 | 2013-11-13 | 中国南方航空工业(集团)有限公司 | Forming method for ceramic die core |
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| CN110156446A (en) * | 2019-04-08 | 2019-08-23 | 启东市聚旺铸造有限公司 | The production method of ceramic mold for casting hollow turbo blade |
| CN110732637A (en) * | 2019-09-25 | 2020-01-31 | 西安交通大学 | turbine blade air film hole precision forming method |
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